A325 Heavy Hex Bolt

ASTM F3125 Grade A325 heavy hex bolts are high strength structural bolts manufactured from medium carbon steel, carbon boron, or medium carbon alloy steel. A325 hex bolts are available in diameters from 1/2" through 1 1/2" inclusive. Dimensional specifications are governed by ASME B18.2.6. Grade markings consists of both the grade symbol "A325" and the manufacturer's identification mark. Inch series fasteners meeting ASTM F3125 Grade A325 specifications are intended for use in steel to steel structural connections. Grade A325 heavy hex bolts offer a heavy pattern head to increase the bearing surface and distribute the clamping load over a larger area.

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Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsA325

Per ASME B18.2.6-2010
Nominal Diameter		UNC	UNF	E		F			G		H			LT	Y
				Body Diameter		Width Across Flats			Width Across Corners		Head Height			Thread Length	Transition Length
				Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Ref	Max
1/2	0.500	13	20	0.515	0.482	7/8	0.875	0.850	1.010	0.969	11/32	0.364	0.302	1.000	0.190
5/8	0.625	11	18	0.642	0.605	1 1/16	1.062	1.031	1.227	1.175	27/64	0.444	0.378	1.250	0.220
3/4	0.750	10	16	0.768	0.729	1 1/4	1.250	1.212	1.443	1.383	1/2	0.524	0.455	1.380	0.250
7/8	0.875	9	14	0.895	0.852	1 7/16	1.438	1.394	1.660	1.589	37/64	0.604	0.531	1.500	0.280
1	1.000	8	14	1.022	0.976	1 5/8	1.625	1.575	1.876	1.796	43/64	0.700	0.591	1.750	0.310
1 1/8	1.125	7	12	1.149	1.098	1 13/16	1.812	1.756	2.093	2.002	3/4	0.780	0.658	2.000	0.340
1 1/4	1.250	7	12	1.277	1.223	2	2.000	1.938	2.309	2.209	27/32	0.876	0.749	2.000	0.380
1 3/8	1.375	6	12	1.404	1.345	2 3/16	2.188	2.119	2.526	2.416	29/32	0.940	0.810	2.250	0.440
1 1/2	1.500	6	12	1.531	1.470	2 3/8	2.375	2.300	2.742	2.622	1	1.036	0.902	2.250	0.440

All dimensions are in inches.

A325 Heavy Hex Bolt

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Diameter	Thread Pitch	Length	Threading	Origin	Item #	Availability	Price	Quantity
1/2	13	1 1/4	Partial	Unrestricted Origin	325B0500125-I	3-5 Working Days	$1.41011/EA	EA	EA
1/2	13	1 1/2	Partial	North American	325B0500150-U	3-5 Working Days	$1.38209/EA	EA	EA
1/2	13	1 3/4	Partial	Unrestricted Origin	325B0500175-I	In Stock	$0.29673/EA	EA	EA
1/2	13	2	Partial	Unrestricted Origin	325B0500200-I	In Stock	$0.87619/EA	EA	EA
1/2	13	2 3/4	Partial	North American	325B0500275-U	3-5 Working Days	$1.50411/EA	EA	EA
1/2	13	4	Partial	North American	325B0500400-U	3-5 Working Days	$1.50684/EA	EA	EA
5/8	11	1 1/2	Full	North American	325B0620150-U	In Stock	$2.46334/EA	EA	EA
5/8	11	1 3/4	Partial	Unrestricted Origin	325B0620175-I	In Stock	$0.90101/EA	EA	EA
5/8	11	2	Partial	Unrestricted Origin	325B0620200-I	In Stock	$0.93671/EA	EA	EA
5/8	11	2 1/4	Partial	North American	325B0620225-U	In Stock	$3.27457/EA	EA	EA
5/8	11	2 1/2	Partial	Unrestricted Origin	325B0620250-I	In Stock	$0.5663/EA	EA	EA
5/8	11	4	Partial	North American	325B0620400-U	3-5 Working Days	$3.4058/EA	EA	EA
3/4	10	1 3/4	Partial	Unrestricted Origin	325B0750175-I	In Stock	$0.87887/EA	EA	EA
3/4	10	2	Partial	Unrestricted Origin	325B0750200-I	In Stock	$1.51979/EA	EA	EA
3/4	10	2 1/4	Partial	Unrestricted Origin	325B0750225-I	In Stock	$2.19871/EA	EA	EA
3/4	10	2 1/2	Partial	Unrestricted Origin	325B0750250-U	In Stock	$2.11944/EA	EA	EA
3/4	10	2 3/4	Partial	Unrestricted Origin	325B0750275-I	In Stock	$1.93137/EA	EA	EA
3/4	10	3	Partial	Unrestricted Origin	325B0750300-I	3-5 Working Days	$1.19859/EA	EA	EA
3/4	10	3 1/4	Partial	Unrestricted Origin	325B0750325-I	In Stock	$1.03539/EA	EA	EA
3/4	10	3 1/2	Partial	Unrestricted Origin	325B0750350-I	In Stock	$1.10888/EA	EA	EA
3/4	10	4	Partial	North American	325B0750400-U	3-5 Working Days	$6.51798/EA	EA	EA
3/4	10	4 1/2	Partial	North American	325B0750450-U	3-5 Working Days	$2.91892/EA	EA	EA
7/8	9	1 3/4	Partial	Unrestricted Origin	325B0870175-I	In Stock	$5.76402/EA	EA	EA
7/8	9	2	Partial	Unrestricted Origin	325B0870200-I	In Stock	$1.60266/EA	EA	EA
7/8	9	2 1/4	Partial	Unrestricted Origin	325B0870225-I	In Stock	$1.55347/EA	EA	EA
7/8	9	2 1/2	Partial	Unrestricted Origin	325B0870250-I	In Stock	$1.65687/EA	EA	EA
7/8	9	3 1/2	Partial	Unrestricted Origin	325B0870350-I	In Stock	$1.62162/EA	EA	EA
7/8	9	4	Partial	Unrestricted Origin	325B0870400-I	3-5 Working Days	$11.84881/EA	EA	EA
7/8	9	5	Partial	North American	325B0870500-I	In Stock	$7.7262/EA	EA	EA
7/8	9	5 1/2	Partial	North American	325B0870550-I	In Stock	$4.5117/EA	EA	EA
1	8	3	Partial	North American	325B1000300-U	In Stock	$5.12959/EA	EA	EA
1	8	3 1/2	Partial	North American	325B1000350-I	3-5 Working Days	$2.84371/EA	EA	EA
1	8	3 3/4	Partial	North American	325B1000375-I	In Stock	$2.97297/EA	EA	EA
1	8	4	Partial	North American	325B1000400-I	In Stock	$3.87779/EA	EA	EA
1	8	4 3/4	Partial	North American	325B1000475-U	3-5 Working Days	$12.33843/EA	EA	EA
1	8	5	Partial	North American	325B1000500-U	3-5 Working Days	$5.5329/EA	EA	EA
1	8	5 1/2	Partial	North American	325B1000550-U	3-5 Working Days	$10.31915/EA	EA	EA
1	8	6	Partial	North American	325B1000600-I	In Stock	$22.10341/EA	EA	EA
1 1/4	7	3 1/4	Partial	North American	325B1250325-U	3-5 Working Days		EA	EA
1 1/4	7	3 1/2	Partial	North American	325B1250350-I	In Stock	$0.0235/EA	EA	EA
1 1/4	7	4	Partial	North American	325B1250400-U	3-5 Working Days	$6.84818/EA	EA	EA
1 1/4	7	4 3/4	Partial	North American	325B1250475-U	3-5 Working Days	$8.0475/EA	EA	EA
1 1/4	7	6 1/2	Partial	North American	325B1250650-I	3-5 Working Days	$8.69565/EA	EA	EA

ASTM F3125	Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
ASME B18.2.6	Covers the general and dimensional data for five products in the inch series recognized as American National Standard. These five structural products include: (a) Heavy Hex Structural Bolts: ASTM A 325 or ASTM A 490; (b) Heavy Hex Nuts: ASTM A 563; (c) Hardened Steel Washers; Circular, Circular Clipped or Beveled: ASTM F436; (d) Compressible Washer-Type Direct Tension Indicators: ASTM F 959; (e) Twist-Off-Type Tension Control Structural Bolts: Heavy Hex and Round: ASTM F1852.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

SC	Slip Critical Connection
N	Bearing type connection with threads in the shear plane.
X	Bearing type connection with no threads in the shear plane.

Alloy Steel, Quenched & Tempered			Per ASTM F3125/F3125M-15a
Grade A325	Tensile Strength	Yield Strength	Elongation in 4D	Reduction in Area
Grade A325	Min psi	Min psi	Min %	Min %
Inch 120 ksi	120,000	92,000	14	35

Per ASTM F3125/F3125M-15a
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Boron
Grade	Material	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
A325 Type 1	Carbon or Alloy Steel with or without Boron	0.30-0.52	0.60 min	0.035 max	0.040 max	0.15-0.30	0.003 max

A325 Heavy Hex Bolt

Technical Data

Governing Standards

Governing StandardsA325

Mechanical Properties

Mechanical PropertiesA325

Chemical Properties

Chemical PropertiesA325

Dimensional Specifications

Dimensional SpecificationsA325

Diameter

Thread Pitch

Length

Threading

Width Across Flats

Country of Origin